Log Message:
www/hackernews-tui: update to 0.4.0

Application changes:
-add story_pooling feature
-add page_scrolling feature
-add support for user's config
-fix the flickering issue with crossterm-backend using cursive_buffered_backend.

Codebase changes:
-implement new features listed above.
-add application command line arguments.
-add config.rs to handle application's configurations.
-clean up imports in prelude.rs